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A kind of method for preparing regenerated disperse dye easily dyeable polyester by alcoholysis of waste polyester

A technology for disperse dyes and waste polyester, which is applied in the preparation of ester group and hydroxyl group reaction, dyeing method, organic chemistry and other directions, which can solve the problem of large fluctuation of by-product diethylene glycol content, poor color phase change of recycled polyester, and difficult control of melting point. and other problems, to achieve the effect of stabilizing the quality of alcoholysis products, reducing by-products, and realizing high-value recycling.

Active Publication Date: 2019-10-11
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in the above methods of obtaining ethylene terephthalate or oligomers through alcoholysis of ethylene glycol, and then performing polycondensation, due to the uncertainty of the source of raw materials, the hue of the recycled polyester will become poor, and the by-product diglycol The content of alcohol (DEG) fluctuates greatly, and the melting point is not easy to control, which reduces the quality of the product

Method used

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  • A kind of method for preparing regenerated disperse dye easily dyeable polyester by alcoholysis of waste polyester
  • A kind of method for preparing regenerated disperse dye easily dyeable polyester by alcoholysis of waste polyester

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Embodiment 1

[0017] A kind of waste polyester alcoholysis method of the present embodiment prepares the method for regenerated disperse dye easily dyeable polyester, such as figure 1 As shown, it includes the following steps: 1) pretreatment of waste polyester, directly smashing the clean waste polyester blocks into the feed bin, cutting the clean waste polyester fibers into the feed bin, and waste polyester bottle flakes Sorting, cleaning, impurity removal, crushing, cutting, and then feeding into the silo, and then mixing ingredients for the next process; 2) alcoholysis of waste polyester, the pretreated waste polyester, according to waste polyester (waste polyester) The molar percentage ratio of 1:2 is put into the alcoholysis kettle 1, and the alcoholysis kettle 1 contains ethylene terephthalate and oligomer (mother liquor) (adding in the first additive inlet 8), wherein the addition of ethylene terephthalate and oligomer (mother liquor) accounts for 40% of the total mass percentage of...

Embodiment 2

[0021]As described in Example 1, the difference is: the molar percentage of waste polyester and ethylene glycol is 1:4, and the alcoholysis still contains ethylene terephthalate and oligomers (mother liquor), wherein the The addition amount of ethylene glycol diformate and oligomer (mother liquor) accounted for 30% of the total mass percentage of input waste polyester, the reaction temperature was 200° C., and the reaction time was 4 hours. Add 0.2‰ (accounting for the mass percent of the product obtained) of phosphorous acid stabilizer; the esterification reaction temperature is 230 ° C, the reaction time is 1.5 hours, and simultaneously add 10% (accounting for the mass percent of the product obtained) of polyethylene glycol (PEG), 0.4% (accounting for the mass percent of the obtained product) of DEG, so that the DEG content (accounting for the obtained product mass percent) of the esterified product is 2.6%. The temperature of polycondensation-I and polycondensation-II is co...

Embodiment 3

[0024] As described in Example 1, the difference is that the molar percentage of waste polyester and ethylene glycol is 1:6, and the alcoholysis still contains ethylene terephthalate and oligomers (hereinafter referred to as mother liquor), wherein The amount of ethylene terephthalate and oligomer (mother liquor) added accounted for 20% of the total mass percentage of waste polyester input, the reaction temperature was 190°C, and the reaction time was 2 hours. Add 0.2‰ (accounting for the mass percent of the product obtained) of trimethyl phosphate stabilizer; the esterification reaction temperature is 220 ° C, the reaction time is 1 hour, and simultaneously add 15% (accounting for the mass percent of the product obtained) of polyethylene glycol (PEG), 0.1% (accounting for the mass percent of the obtained product) of DEG, so that the DEG content in the esterified product (accounting for the obtained product mass percent) is 2.5%. The temperature of polycondensation-I and polyc...

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Abstract

The invention discloses a method for preparing regenerated disperse dye easy-to-dye polyester through a waste polyester alcoholysis method. The method comprises: 1) pre-treating waste polyester; 2) carrying out alcoholysis on the waste polyester; 3) carrying out quality control on an esterified product, and adding a polyethylene glycol or polyethylene glycol adipate copolymerization monomer; and 4) carrying out condensation polymerization, and preparing slices, wherein the finally obtained regenerated disperse dye easy-to-dye polyester has the intrinsic viscosity of 0.60-0.70 dl / g, the meltingpoint of 220-240 DEG C, the diethylene glycol content of 3.0+ / -0.3%, and the chromaticity b value of less than 8. According to the present invention, the prepared regenerated disperse dye easy-to-dyepolyester can be used for preparing disperse dye easy-to-dye polyester filaments and staple fibers, and can achieve the high-value recycling of waste polyester.

Description

technical field [0001] The invention relates to a method for preparing regenerated disperse dye easily dyeable polyester by alcoholysis of waste polyester, which belongs to the field of recycling and utilization of waste polyester. Background technique [0002] Polyethylene terephthalate (PET, polyester for short), as an important raw material, is widely used in the production of beverage bottles, fibers, films, sheets, etc. With the rapid development of the polyester industry, the polyester waste produced during the production of polyester and the processing and use of its products is also increasing rapidly. Due to the strong chemical inertness of polyester, it is difficult to degrade or be decomposed by microorganisms in natural storage, which not only causes a huge waste of resources, but also produces serious environmental pollution. Therefore, realizing a virtuous cycle of resources and improving environmental quality through recycling has become an important issue in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/672C08G63/78C07C69/82C07C67/03D06P3/54
Inventor 王秀华曹宇恒张须臻
Owner ZHEJIANG SCI-TECH UNIV
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